The Louvain University library was burned in this 
The Louvain University library was burned in this country. Its city of Liege was besieged at the start of World War I, and another battle here included the first use of poison gas on the Western Front at Ypres. The route of the failed Schlieffen plan went through this country, whose king Leopold II profited from its brutal colony in the Congo. For 10 points, name this European country containing Flanders, whose French south and Dutch north dispute issues in Brussels.
The Louvain University library was burned in this country. Its city of Liege was besieged at the start of World War I, and another battle here included the first use of poison gas on the Western Front at Ypres.
Kingdom of {Belgium} [accept {Royaume} de {Belgique} or {Konigkrijk België}]